the finest for buds 

 ous grower in tlie Priiicess Adelaide of 

 which a very handsome painting is 

 shown our readers in this number. It 

 is an old variety, originated by Lafiay 

 in 1845, but 



CANADIAN HORTICULTURIST. 

 but the most vigor 



is one of the most 



desirable of its class. The foliage 

 is large and sometimes variegated ; 

 its bright • pink, or rose colored, 

 flowers are produced in clusters, 

 and are very double and well 

 formed. 



DOWNY MILDEW. 



PROF. F. LAMSON SCRIBNER 

 of the Botanical Division of the 

 Department of Agriculture of the 

 United States, has just issued a report 

 that is of considerable interest to grape 

 growers. It contains the result of ex- 

 tended experiments conducted during 

 1887 in various parts of the United 

 States, under the direction of the de- 

 partment, with several preparations of 

 salts of copper for tiie destruction of 

 Downy Mildew and Grape Rot. 



A previous report had well described 

 these fungi, and so prepared the way 

 for intelligent operations. The Downy 

 Mildew (Peronospora viticola) is of 

 common occurence in Canada, especial- 

 ly upon some of the finer varieties, as 

 for instance the Salem, and is para- 

 sitic upon the leaves, young shoots and 

 berries. The mycelium, or vegetable 

 portion of this fungus, is only to be 

 seen by microscopic examination of tlie 

 green p9rtions of the vine in which it 

 grows. It does not penetrate the cells 

 of the leaves, but grows between them, 

 drawing nourishment from them how- 

 ever by means of minute suckers. A.s 

 a result the cells turn brown, and ulti- 

 mately the change of color is noticeable 

 externally. 



The downy white patches of mould 

 from which this mildew gets its name, 



and which are unfortunately so well 

 known to grape growers, appear on the 

 under side of the leaves, and are slen- 

 der filaments growing out from the 

 mycelium through the breathing pores 

 {stomata) of the leaves. Upon these 



the summer spores are produced, tiny 

 organisms corresponding to seeds of 

 plants, so small that their longest dia- 

 meter is only the six ten-thousandth 

 part of an inch. 



Fig. 61, which we copy from ^Ir. 



